...On the first day of tapping, the sap is too sweet; it is best during the following week and, when it becomes tart, no more must be drawn or the tree will be injured... 
Richard F. Burton 「Two Trips to Gorilla Land and the Cataracts of the Congo Volume 2」
...Palm-wine is the sap of the tree; and its top furnishes a most delicious dish, called palm-cabbage...
Horatio Bridge 「Journal of an African Cruiser」
...Long to'ds de fall, w'en de sap went down, Henry begin ter gitole ag'in same ez yuzhal, en his noo marster begin ter git skeered les'nhe gwine ter lose his fifteen-hunder'-dollar nigger...
Charles W. Chesnutt 「The Conjure Woman」
..."Nex' spring, w'en de sap ris en Henry's ha'r commence' ter sprout, MarsDugal' sole 'im ag'in, down in Robeson County dis time; en he kep' datsellin' business up fer five year er mo'...
Charles W. Chesnutt 「The Conjure Woman」
...Wen she seedde stump standin' dere, wid de sap runnin' out'n it, en de limbs layin'scattered roun', she nigh 'bout went out'n her min'...
Charles W. Chesnutt 「The Conjure Woman」
... The deadly upas, root and branch, leaf andfibre, body and sap, must be utterly destroyed...
Frederick Douglass 「Collected Articles of Frederick Douglass」
...Fiskehas noticed that they commonly sip the sap of mapletwigs where the squirrels have gnawed the bark...
Clarence M. Weed 「Butterflies Worth Knowing」
..."
But it must be admitted that very rarely does the sapsucker girdle atree with holes enough to sap away its life...
Neltje Blanchan 「Birds Every Child Should Know」
...We know that the white birch is fullof excellent sap, from which can be made a birchcandy, somewhat bitter, but nearly as good ashorehound candy...
Fannie Hardy Eckstorm 「The Woodpeckers」
...That he got, and may have drunk, the sap...
Fannie Hardy Eckstorm 「The Woodpeckers」
...What ishis object? Good observers have stated thathe draws a little sap in order to attract flies andwasps; that the sap is not drawn for its ownsake, but as a bait for insects...
Fannie Hardy Eckstorm 「The Woodpeckers」
... The sap was flowing, andleafless trees were covered with swelling buds...
Gene Stratton-Porter 「The Song of the Cardinal」
...It notonly extracts sap thus weakening theplant but it also seems to poison theplant while feeding...
Leonard Haseman 「An Elementary Study of Insects」
...Since it feeds on liquid sap onlyit is impossible to kill it by sprayingthe crop with a poison such as arsenateof lead...
Leonard Haseman 「An Elementary Study of Insects」
...The loss of sap together withthe poisoning effect of the bite causesthe weakening of the plant or leaf withits ultimate death if feeding continues...
Leonard Haseman 「An Elementary Study of Insects」
...In the spring these eggshatch and the tiny nymphs begin toextract sap...
Leonard Haseman 「An Elementary Study of Insects」
...Here they imbibethe sap by suction alone, and, by the simple pressure of their bodiesbecome imbedded in the side of the stem...
Alpheus Spring Packard 「Our Common Insects」
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